Study On The Geological And Geochemical Characteristics Of Yanshannian Granitoids In The Xiong’ershan Area

Western Henan province is the second largest gold deposit, only next to Jiaodong Region, and Xiong’ershan area is one of the most important Au-Mo polymetallic metallogenic belt. This comprehensive study on the geological and geochemical characteristics of Yanshannian granitoids in the Songxian, Xiong’ershan area, west Hennan provnice; prospecting prognosis of Au-Mo deposit in the Songxian area, Hennan province of China National Gold Group Corporation. Main achieved the understanding and conclusions:1.①Each granite and porphyry are all rich of alkali and potassic ,and belong to sub-alkaline and high-K calc-alkaline rock series.②Upper continental crust normalized REE distribution patterns are divided into six categories:Ⅰ- the flat type (Wuzhang granite, Granite porphyry or breccia of Gongyu section in Qiyugou mining);Ⅱ- the LREE flat、the HREE (micro-right) right type (Huashan granite, quarta porphyry and granite porphyry or breccia of Qiyugou mining);Ⅲ- the right type (Jinshanmiao granite、Heyu granite);Ⅳ- the right with negative Eu anomaly type (Jinshanmiao granite);Ⅴ- the LREE right、the HREE left with positive Eu anomaly type (K-feldspar quarta porphyry or breccia and granite porphyry or breccia of Gongyu section in Qiyugou mining, quarta porphyry of Niutougou mining);Ⅵ- the slow right type with weak positive Eu anomaly type (porphyritic granite or granite porphyry of Niutougou mining).③Upper continental crust trace element spider diagrams: Wuzhangshan granite compared to the continental crust is significantly enriched Ba, Sr, and loss of Ta, Ti, Sc, and compared to the NASC is significantly enriched Sr and loss of Ti, Sc; Huashan granite (porphyritic granite and giant porphyritic) compared to the NASC is significantly enriched Sr, and fine-grained monzogranite compared to the NASC is significantly enriched U and loss of Ba, Y, Yb, Ti, Sc; Heyu granite compared to the continental crust is significantly enriched Rb, Th, U, Ba and loss of Sc.2. The diagenetic ages of Wuzhangshan granite body are 164Ma, 157Ma, and is multiple emplacement complex granite body; There are 156Ma, 132Ma, 128Ma, 123Ma at least diagenetic ages of Huashan granite body, and there may be 171Ma, 142Ma, 136Ma diagenetic ages, and there may be 110Ma, 103Ma, 83Ma diagenetic ages or ages of thermal metamorphism, and is multiple emplacement complex granite body; There are 136Ma, 131Ma, 126Ma, 116Ma at least diagenetic ages of Heyu granite body, and there may be 149Ma, 109Ma diagenetic ages, and there may be 102Ma diagenetic ages or ages of thermal metamorphism, and is multiple emplacement complex granite body; There are 144Ma, 136Ma, 128Ma at least diagenetic ages of Leimengou granite porphyry.3. Granite bodys are I type and S type on causes mechanism diagram; Speculated that the granite source rocks may be too much from the Taihua group and (or) Xiong’er group rocks by lead, sulfur, oxygen isotope tracer and Y-Yb, Nb-Ta, Zr-Hf distribution of high field strength elements, and granite inherited zircon age of tracer. Granite and porphyries were formed in the orogenic belt, and were post-orogenic tectonic setting.